ices/83919.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83919

#![feature(type_alias_impl_trait)]

use std::future::Future;

trait Foo {
    type T;
    type Fut2: Future<Output=Self::T>; // ICE gets triggered with traits other than Future here
    type Fut: Future<Output=Self::Fut2>;
    fn get_fut(&self) -> Self::Fut;
}

struct Implementor;

impl Foo for Implementor {
    type T = u64;
    type Fut2 = impl Future<Output=u64>;
    type Fut = impl Future<Output=Self::Fut2>;

    fn get_fut(&self) -> Self::Fut {
        async move {
            42
            // 42 does not impl Future and rustc does actually point out the error, but rustc also panics.
            // Putting a valid Future here works fine.
        }
    }
}

=== stdout ===
=== stderr ===
error[E0601]: `main` function not found in crate `83919`
  --> /home/runner/work/glacier/glacier/ices/83919.rs:26:2
   |
26 | }
   |  ^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/83919.rs`

error[E0277]: `{integer}` is not a future
  --> /home/runner/work/glacier/glacier/ices/83919.rs:20:9
   |
20 | /         async move {
21 | |             42
22 | |             // 42 does not impl Future and rustc does actually point out the error, but rustc also panics.
23 | |             // Putting a valid Future here works fine.
24 | |         }
   | |_________^ `{integer}` is not a future
   |
   = help: the trait `Future` is not implemented for `{integer}`
   = note: {integer} must be a future or must implement `IntoFuture` to be awaited

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0277, E0601.
For more information about an error, try `rustc --explain E0277`.
==============